This document discusses inequality and its importance to the post-2015 development agenda. It notes that international institutions like the OECD and IMF have changed their views to acknowledge that economic growth does not automatically reduce inequality and that greater inequality does not foster social mobility. The document also discusses how inequality is a rising topic in academic literature and the media. It examines data showing rising global inequality and the fragility of the global middle class. While some growth can help reduce poverty in the short term, unequal growth can be detrimental and inequality itself hinders poverty reduction and economic growth over the long term. The post-2015 agenda needs to explicitly address inequality and promote more inclusive growth that takes into account the various drivers of rising inequality.